Under the iTunes in the Cloud section, click Manage Devices. (If you haven't associated any devices with your Apple ID, you won't see the Manage Devices section.) Information about each associated device appears. Next to each device, you can see when it associated with your Apple ID.
The real reason why the burp smells so badly is hydrogen sulfide (H2S). If you eat foods that have sulfur proteins in them then you may find yourself burping the H2S, which will smell like rotten eggs. The sulfur reducing microbes in the intestine digest the proteins and release the gas.
Eating some types of food can leave you with burps that smell like rotten eggs. To reduce your risk of eggy burps, cut down on red meat, eggs, canned food, dairy products, garlic, onion, sweet potato, asparagus, tomato, broccoli, peas, beans, and soy. Fruit to avoid include bananas, coconuts and cashew nuts.